Gas burner



ing axial channel 3|. The channels 29 are shown as circular in cross section, `but this circularity is of no particular significance insofar as the central channel 3| is concerned.

The central channel 3| is in direct communi? cation' with a tubular tting 32 to which is connected a pipe 33 to which either gas or air may be supplied by the supply pipes 34 and 35, re-

spectively. B ydischarging a. relatively highvelocity stream of gas or air or a mixture of air and gas from the channel 3|, the otherwise substantially non-turbulent composite 'stream of air.v and gas flowing from the tunnel can be' made sultant products of combustion will contain unburned fuel vand therefore be reducing in character as that term is commonly understood in 'heat-treating operations involving controlled atmospheres. Y

The main gas supply pipe for the chamber l5 is indicatedk at 31, the same being provided with a control valve 36. 'I'he air pipe 35 in addition to being `utilized for supplying air to the pipe ber l5.

v33 may be utilized for adding air tothe gas lflowing to thechamber I5. To this end the pipe v35 may be extended to the main gas valve 36, f the latter being of such constructionthat without *shutting off the gas'it may be operated to Aallow both air and gas -to flow to the said cham- In Fig. 4, the tunnel isshown asv of a length to extend beyond the outer face of the furnace wall I0 andthe casing |2 as being disconnected 45j from such wall but these are immaterial details f of construction aswill be readily appreciated.

The construction shown in Fig. '6 corresponds -to that in Fig. 1' in that the body Zla, like the body 2| in Fig. 1,is provided with radial walls 28a having 'individual channels 29a therein which extend through the head 22a. of said body, the head forming a closure for one'sidevof a'gas chamber |5a` formed vinthe casing |2a.' and the spaces 30a-formed between the radial Walls 28a being in-communication with the air chamber Ila in "vsaid casing. However, in Fig. 6, the rim "of the head 22a is confined between a shoulder "20a and the adjacent end ofthe tunnel Ila, the f head havingcircumferentially extending passages y 38 which are in direct communication with or form Ythe beginning of the spaces 30a between the radial walls 28a. i f U rAnother distinction is that whereas in-Fig. 1

the walls 28 are of substantially the'same cross sectional area throughoutr their lengths, in Fig.

" 6 (and this also'applies tothe walls 28 n Fig.

4) thesides of the respective walls 28a' are not in parallelism with channels in the walls but are at an angle with respect thereto as clearly shown inV Fig. 6. In other words the space 30a between adjacent walls 28a gradually increases in cross sectional area from the head of the body 2 a towards the discharge I end thereof. Such con.-

gstruction isv conducive to stream line owof air 1 of which the head as will be readily under-v vassembled to the ingress of air, the said body be 'an' elongate body provided with from the chamber Ila and withal provides a body of great strength.

What I claim is:

1. A gasburner comprising in combination, an elongatel body provided with walls radiating 5 therefrom and extending longitudinally thereof andhaving a head at one end, a gas chamber wherein said head is positioned and for one end forms a closure, a tunnel whereinto said bodyprojects, an air Chamberlin l0 direct communication with the spaces between n said walls, and channels extending lengthwise of said body through said walls and head and constituting straightaway ducts for gas.

2. A gas burner comprising in combination, an

*elongate body provided with radial and longituk dinally extending walls and with a head at one end, the spaces between the walls being of increasing depth from their inception adjacent the head toward the opposite end, a gas chamber for one end of'which the head forms a closure, a tunnel whereinl said body projects, the spaces between the radial walls of said body being accessible at their shallow ends when the parts are ing provided with gas passageways extending from end to end, through the head and the radial walls thereof.

3. A gas burner comprising in combination, anV elongate body provided with radial and longitudinally extending walls and with a head at one end, a gas chamber for one end 'of which the head forms a closure, a tunnel whereinto said ybody projects, the spaces between the radial walls of said body being accessible at the ends adjacent 35 the head, when the parts are assembled, to the ingress of air, channels'extending lengthwise of said body through the head and through the radial walls thereof and constituting straightaway l ducts for gas, a channel extending axially through 40 said body, and a source of gaseous uid in communication with such axial channel.

' 4. A gas burner comprising in combination, an elongate refractory body provided with walls radiating therefrom and extending longitudinally thereof and' having a head atone end, a gas chamber for one end of which said head forms a closure, a tunnel whereinto said body projects, an air chamber in direct communication with the spaces between said walls, and channels ex- V tending lengthwise oi' said body through said walls and head and constituting straight-away ducts for gas.

5. A gas burner comprising, in combination, an

elongate body provided with radial and longitu# dinally extending walls and with a head at one `end and being provided with gas passages ex tending 'from end to end through the head and the' radial walls thereof, walls cooperating with said head to form a gas-supply chamber in direct communication with said passages, a tunnel whereinto said body projects, and means forA delivering air to said tunnel by Way'of the spaces between the'radial walls Vof said body.

6. A gas burner comprising, in combination,

radial and longitudinally extending walls and with a head at one end and being provided with gas passages extending from end to end through the head and the radial Walls thereof, a tunnel whereinto said body projects, means cooperating with said head and one end, of said tunnel to form an air supply chamber in direct communication with the spaces between the radial Walls of said body, and means 

